Long flowering climber

Good Morning, another beautiful sunny day in Snowdonia!!! I want to find a climber to grow up a slate garden wall about 8ft high. It will need to be grown in a container as on concrete path. Shade all morning but sun from mid afternoon. Don't mind colour, evergreen would be nicer but that's justwishful thinking maybe. The pot can be long but not more than foot and half wide.

For any who saw my first posts , my tiny borders have now been extended and looking quite colourful!!! Rather pleased! Thanks for the advice so far!!